Loneliness hits different when you're a parent

I'm surrounded by people all day. Three kids, work, activities. But I'm so lonely it's scary sometimes. All my friendships are surface level now, haven't had a real conversation with another adult in weeks. Wife is great but she's exhausted too and I can't dump all my mental stuff on her. Feel like I'm supposed to just be fine, be strong, take care of everyone. Therapist says it's common but knowing it's common doesn't fix the feeling of being in a crowd completely alone. Anyone else?